Synthesis, characterization and micellization behaviour of some surface active mixed-ligand complexes of cobalt(III)

Micelle formation of some surface active mixed-ligand cobalt(III) complexes containing one of the chelating ligands ethylenediamine (en), triethylenetetramine (trien), 2,2 bipyridyl (bpy) or 1,10 phenanthroline (phen) as equatorial and with different axial amine ligands (dodecylamine or cetylamine) were synthesized and characterized by IR, NMR, UV–visible electronic absorption spectra and elemental analysis. The critical micelle concentration (CMC) values of these surfactant metal complexes in aqueous solution were obtained from conductance measurements. Specific conductivity data (at 303, 308 and 313 K) served for the evaluation of the temperature-dependent CMC and the thermodynamics of micellization (ΔGm0, ΔHm0 and ΔSm0).

A number of mixed ligand cobalt(III)–surfactant coordination complexes were synthesized from the corresponding dihalogeno complexes by the ligand substitution method. These compounds form a foam in aqueous solution when shaken. The critical micelle concentration (CMC) values of these surfactant metal complexes in aqueous solution were obtained from conductance measurements. Specific conductivity data (at 303, 308 and 313 K) served for the evaluation of the temperature-dependent critical micelle concentration (CMC) and the thermodynamics of micellization (ΔGm0, ΔHm0 and ΔSm0) are discussed.Figure optionsDownload as PowerPoint slide